WOODWARD Digital Controller 5466-258 Discrete I/O Module

Description

Additional hardware is required when a RS-232 serial port connection on either the MicroNet CPU (040) or (Pentium) module is needed (see Appendix A for the CPU Serial Interface (RS-232–RS-232) FTM part number). These communication ports are non-isolated. A shielded cable and Serial Port Isolator/Converter are required when using any of these ports to avoid susceptibility to EMI noise and ground loops related to PC connections and typical industrial environments. Depending on the CPU type, the hardware may include the following parts:

Ea Filter–RS-232 Db9mf

Ea Cable–10 ft. Molded Db9f to Db9f Null Modem w/thumbscrews

Ea Converter–Isolated RS-232–RS-232, Phoenix Contact, DIN Rail

The basic principle of model selection is to strive for the best performance price ratio while meeting functional requirements and ensuring reliability and convenient maintenance.
1. Reasonable structural type
The average price of each I/O point in an integrated PLC is cheaper than that of a modular PLC, and its volume is relatively small, so it is generally used in small control systems with relatively fixed system processes; The functional expansion of modular PLC is flexible and convenient, with a wide range of options in terms of the number of I/O points, the ratio of input points to output points, and the types of I/O modules. It is also convenient to determine the scope of the fault by simply replacing the module during maintenance. Therefore, modular PLCs are generally suitable for complex systems and environments with poor maintenance capacity.
2. Selection of installation method
According to the installation method of PLC, the system is divided into centralized, remote I/O, and distributed with multiple PLCs connected to each other. Centralized does not require the installation of remote I/O hardware, resulting in fast system response and low cost. Large systems often adopt remote I/O mode because their devices have a wide distribution range. Remote I/O devices can be installed dispersedly near I/O devices, and the I/O connection is shorter than centralized ones. However, additional drivers and remote I/O power supplies are required. The distributed network of multiple devices is suitable for situations where multiple devices are independently controlled and interconnected. Small PLCs can be selected, but additional communication modules are necessary.
3. Equivalent functional requirements
Generally, small (low-end) PLCs have functions such as logic operation, timing, counting, etc., which can be met for devices that only require on-off control. For systems with switch based control and a small amount of analog control, A/D and D/A units can be selected. Has addition and subtraction arithmetic operations. Enhanced low-end PLC with data transmission function.
For complex control, it is required to achieve functions such as PID calculation, closed-loop control, and communication networking. Depending on the size and complexity of the control scale, medium or high-end PLCs can be selected. However, mid to high-end PLCs are more expensive, and generally large machines are mainly used for large-scale process control and distributed control systems.
4. Requirements for response speed
The delay caused by the scanning operation of PLC can reach 2-3 scanning cycles. For most applications, the response speed of PLC can meet the requirements and is not the main issue. However, for certain individual situations, it is required to consider the response speed of the PLC. In order to reduce the delay time of PLC’s I/O response, a PLC with high scanning speed, a PLC with high-speed I/O processing instructions, or a PLC with fast response module and interrupt input module can be selected.
5. Requirements for system reliability
The reliability of general system PLCs can be met. For systems with high reliability requirements, consideration should be given to whether to use redundant control systems or hot standby systems.
6. Unified model
A company should strive to achieve uniform PLC models. We mainly consider the following three aspects:
(l) PLCs of the same model have the same programming method, which is beneficial for training technical personnel and improving technical level.
(2) PLC modules of the same model can serve as backup for each other, facilitating the procurement and management of spare parts.
(3) The peripheral devices of the same model of PLC are universal, resources can be shared, and it is easy to communicate with the network. After being equipped with an upper computer, it is easy to form a multi-level distributed control system.

5466-257
5466-258
5466-260
5466-272
5466-285
5466-315
5466-316
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5466-1000
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